CVE-2026-21855 CRITICAL

CVE-2026-21855: Tarkov Data Manager has Unauthenticated Reflected XSS

Vendor The-Hideout
Product tarkov-data-manager
Weakness CWE-79 · XSS
Published January 7, 2026
Last update January 7, 2026
View on NVD All CVEs

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

What the vulnerability does

01Description

The Tarkov Data Manager is a tool to manage the Tarkov item data. Prior to 02 January 2025, a reflected Cross Site Scripting (XSS) vulnerability in the toast notification system allows any attacker to execute arbitrary JavaScript in the context of a victim's browser session by crafting a malicious URL. A series of fix commits on 02 January 2025 fixed this and other vulnerabilities.

Key dates

02Disclosure timeline

January 7, 2026 CVE published
January 7, 2026 Record updated